PY$-290$ Unit $3$: Central Tendency

Practice Problems

Ten customers rated a restaurant on

Yelp.com and the average score was $4$ stars out of

After one particularly bad experience, however, one of the customers who had

previously provided a rating for the restaurant went back to the website and changed

his rating from a $5$ to a $1.$

a$.$ Without any calculations, what effect does this change have on the mean rating for

the restaurant? Explain your answer.

b$.$ Calculate the new mean rating for the restaurant.